2/3. 1901. Tarmac, the electrocardiogram, and the Texas oil industry all made a splash in 1901, as did the first Royal Navy submarine, built with every secrecy at Barrow and launched "as an experiment" without ceremony on 2 October. But why did the Navy consider the submarine an un-British way to wage war, and how did the sanitary arrangements threaten to undermine the superiority of the officer class? Presenter Adam Hart-Davis explores spectacular years from the maelstrom of mad, bad and dangerous thinking. Producer John Byrne